Cymbopogon flexuosus (lemongrass) oil. Lemongrass essential oil is known for its invigorating and antiseptic properties, and can be used in facial toners as its astringent properties help fight acne and greasy skin. An excellent anti-depressant, lemongrass essential oil tones and fortifies the nervous system. It also makes for a perfect bath to soothe muscular nerves and pain. Lemongrass shares similar properties with citronella and has a great reputation for keeping insects away.